Queen's Indian DefenseThe Queen's Indian Defense is an extremely solid modern defense against the d4 opening from white. It usually arises if white chooses to avoid the Nimzo-Indian defense by bringing his knight to c3 and instead opts to first bring his knight to f3...

The Queens Indian Defense is one of the most respected and solid defenses that black has against white's d4 opening. It is contingent on white playing Nf3 before Nc3 so you might want to have another defense as backup in case white throws you for a loop.